This file contains PHP code used to connect to a target's computer utilizing system applications
The tool is designed for those situations during a pentest where one has upload access to a webserver that’s running PHP. Uploading this script to somewhere in the web root then running it by accessing the appropriate URL in a browser will allow the script to open an outbound TCP connection from the webserver to a host and port of choice. Bound to this TCP connection will be a shell.
This interactive shell will allow one to run interactive programs like telnet, ssh and su. It differs from a web form-based shell which allows one to send a single command, then return the output.